35 lines
1.2 KiB
Rust
35 lines
1.2 KiB
Rust
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use std::fmt::{self, Display};
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/// Path to the current value in the input, like `dependencies.serde.typo1`.
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#[derive(Copy, Clone)]
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pub enum Path<'a> {
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Root,
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Seq { parent: &'a Path<'a>, index: usize },
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Map { parent: &'a Path<'a>, key: &'a str },
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Alias { parent: &'a Path<'a> },
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Unknown { parent: &'a Path<'a> },
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}
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impl<'a> Display for Path<'a> {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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struct Parent<'a>(&'a Path<'a>);
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impl<'a> Display for Parent<'a> {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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match self.0 {
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Path::Root => Ok(()),
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path => write!(formatter, "{}.", path),
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}
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}
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}
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match self {
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Path::Root => formatter.write_str("."),
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Path::Seq { parent, index } => write!(formatter, "{}[{}]", parent, index),
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Path::Map { parent, key } => write!(formatter, "{}{}", Parent(parent), key),
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Path::Alias { parent } => write!(formatter, "{}", parent),
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Path::Unknown { parent } => write!(formatter, "{}?", Parent(parent)),
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}
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}
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}
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